added simple svn statistics graphs, rendered using SVG::Graph

git-svn-id: http://redmine.rubyforge.org/svn/trunk@380 e93f8b46-1217-0410-a6f0-8f06a7374b81

1 files changed, 494 insertions, 0 deletions

diff --git a/lib/SVG/Graph/Plot.rb b/lib/SVG/Graph/Plot.rb
new file mode 100644
index 000000000..290fb8676
--- /dev/null
+++ b/lib/SVG/Graph/Plot.rb
@@ -0,0 +1,494 @@
+require 'SVG/Graph/Graph'
+
+module SVG
+  module Graph
+    # === For creating SVG plots of scalar data
+    # 
+    # = Synopsis
+    # 
+    #   require 'SVG/Graph/Plot'
+    # 
+    #   # Data sets are x,y pairs
+    #   # Note that multiple data sets can differ in length, and that the
+    #   # data in the datasets needn't be in order; they will be ordered
+    #   # by the plot along the X-axis.
+    #   projection = [
+    #     6, 11,    0, 5,   18, 7,   1, 11,   13, 9,   1, 2,   19, 0,   3, 13,
+    #     7, 9 
+    #   ]
+    #   actual = [
+    #     0, 18,    8, 15,    9, 4,   18, 14,   10, 2,   11, 6,  14, 12,   
+    #     15, 6,   4, 17,   2, 12
+    #   ]
+    #   
+    #   graph = SVG::Graph::Plot.new({
+    #   	:height => 500,
+    #    	:width => 300,
+    #     :key => true,
+    #     :scale_x_integers => true,
+    #     :scale_y_integerrs => true,
+    #   })
+    #   
+    #   graph.add_data({
+    #   	:data => projection
+    # 	  :title => 'Projected',
+    #   })
+    # 
+    #   graph.add_data({
+    #   	:data => actual,
+    # 	  :title => 'Actual',
+    #   })
+    #   
+    #   print graph.burn()
+    # 
+    # = Description
+    # 
+    # Produces a graph of scalar data.
+    # 
+    # This object aims to allow you to easily create high quality
+    # SVG[http://www.w3c.org/tr/svg] scalar plots. You can either use the
+    # default style sheet or supply your own. Either way there are many options
+    # which can be configured to give you control over how the graph is
+    # generated - with or without a key, data elements at each point, title,
+    # subtitle etc.
+    #
+    # = Examples
+    # 
+    # http://www.germane-software/repositories/public/SVG/test/plot.rb
+    # 
+    # = Notes
+    # 
+    # The default stylesheet handles upto 10 data sets, if you
+    # use more you must create your own stylesheet and add the
+    # additional settings for the extra data sets. You will know
+    # if you go over 10 data sets as they will have no style and
+    # be in black.
+    #
+    # Unlike the other types of charts, data sets must contain x,y pairs:
+    #
+    #   [ 1, 2 ]    # A data set with 1 point: (1,2)
+    #   [ 1,2, 5,6] # A data set with 2 points: (1,2) and (5,6)  
+    # 
+    # = See also
+    # 
+    # * SVG::Graph::Graph
+    # * SVG::Graph::BarHorizontal
+    # * SVG::Graph::Bar
+    # * SVG::Graph::Line
+    # * SVG::Graph::Pie
+    # * SVG::Graph::TimeSeries
+    #
+    # == Author
+    #
+    # Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
+    #
+    # Copyright 2004 Sean E. Russell
+    # This software is available under the Ruby license[LICENSE.txt]
+    #
+    class Plot < Graph
+
+      # In addition to the defaults set by Graph::initialize, sets
+      # [show_data_points] true
+      # [area_fill] false
+      # [stacked] false
+      def set_defaults
+        init_with(
+          :show_data_points  => true,
+          :area_fill         => false,
+          :stacked           => false
+        )
+        self.top_align = self.right_align = self.top_font = self.right_font = 1
+      end
+
+      # Determines the scaling for the X axis divisions.
+      #
+      #   graph.scale_x_divisions = 2
+      #
+      # would cause the graph to attempt to generate labels stepped by 2; EG:
+      # 0,2,4,6,8...
+      attr_accessor :scale_x_divisions
+      # Determines the scaling for the Y axis divisions.
+      #
+      #   graph.scale_y_divisions = 0.5
+      #
+      # would cause the graph to attempt to generate labels stepped by 0.5; EG:
+      # 0, 0.5, 1, 1.5, 2, ...
+      attr_accessor :scale_y_divisions 
+      # Make the X axis labels integers
+      attr_accessor :scale_x_integers 
+      # Make the Y axis labels integers
+      attr_accessor :scale_y_integers 
+      # Fill the area under the line
+      attr_accessor :area_fill 
+      # Show a small circle on the graph where the line
+      # goes from one point to the next.
+      attr_accessor :show_data_points
+      # Set the minimum value of the X axis
+      attr_accessor :min_x_value 
+      # Set the minimum value of the Y axis
+      attr_accessor :min_y_value
+
+      
+      # Adds data to the plot.  The data must be in X,Y pairs; EG
+      #   [ 1, 2 ]    # A data set with 1 point: (1,2)
+      #   [ 1,2, 5,6] # A data set with 2 points: (1,2) and (5,6)  
+      def add_data data
+        @data = [] unless @data
+       
+        raise "No data provided by #{conf.inspect}" unless data[:data] and
+          data[:data].kind_of? Array
+        raise "Data supplied must be x,y pairs!  "+
+          "The data provided contained an odd set of "+
+          "data points" unless data[:data].length % 2 == 0
+        return if data[:data].length == 0
+          
+        x = []
+        y = []
+        data[:data].each_index {|i|
+          (i%2 == 0 ? x : y) << data[:data][i]
+        }
+        sort( x, y )
+        data[:data] = [x,y]
+        @data << data
+      end
+
+
+      protected
+
+      def keys
+        @data.collect{ |x| x[:title] }
+      end
+
+      def calculate_left_margin
+        super
+        label_left = get_x_labels[0].to_s.length / 2 * font_size * 0.6
+        @border_left = label_left if label_left > @border_left
+      end
+
+      def calculate_right_margin
+        super
+        label_right = get_x_labels[-1].to_s.length / 2 * font_size * 0.6
+        @border_right = label_right if label_right > @border_right
+      end
+
+
+      X = 0
+      Y = 1
+      def x_range
+        max_value = @data.collect{|x| x[:data][X][-1] }.max
+        min_value = @data.collect{|x| x[:data][X][0] }.min
+        min_value = min_value<min_x_value ? min_value : min_x_value if min_x_value
+
+        range = max_value - min_value
+        right_pad = range == 0 ? 10 : range / 20.0
+        scale_range = (max_value + right_pad) - min_value
+
+        scale_division = scale_x_divisions || (scale_range / 10.0)
+
+        if scale_x_integers
+          scale_division = scale_division < 1 ? 1 : scale_division.round
+        end
+
+        [min_value, max_value, scale_division]
+      end
+
+      def get_x_values
+        min_value, max_value, scale_division = x_range
+        rv = []
+        min_value.step( max_value, scale_division ) {|v| rv << v}
+        return rv
+      end
+      alias :get_x_labels :get_x_values
+
+      def field_width
+        values = get_x_values
+        max = @data.collect{|x| x[:data][X][-1]}.max
+        dx = (max - values[-1]).to_f / (values[-1] - values[-2])
+        (@graph_width.to_f - font_size*2*right_font) /
+           (values.length + dx - right_align)
+      end
+
+
+      def y_range
+        max_value = @data.collect{|x| x[:data][Y].max }.max
+        min_value = @data.collect{|x| x[:data][Y].min }.min
+        min_value = min_value<min_y_value ? min_value : min_y_value if min_y_value
+
+        range = max_value - min_value
+        top_pad = range == 0 ? 10 : range / 20.0
+        scale_range = (max_value + top_pad) - min_value
+
+        scale_division = scale_y_divisions || (scale_range / 10.0)
+
+        if scale_y_integers
+          scale_division = scale_division < 1 ? 1 : scale_division.round
+        end
+
+        return [min_value, max_value, scale_division]
+      end
+
+      def get_y_values
+        min_value, max_value, scale_division = y_range
+        rv = []
+        min_value.step( max_value, scale_division ) {|v| rv << v}
+        return rv
+      end
+      alias :get_y_labels :get_y_values
+
+      def field_height
+        values = get_y_values
+        max = @data.collect{|x| x[:data][Y].max }.max
+        dx = (max - values[-1]).to_f / (values[-1] - values[-2])
+        (@graph_height.to_f - font_size*2*top_font) /
+           (values.length + dx - top_align)
+      end
+
+      def draw_data
+        line = 1
+        
+        x_min, x_max, x_div = x_range
+        y_min, y_max, y_div = y_range
+        x_step = (@graph_width.to_f - font_size*2) / (x_max-x_min)
+        y_step = (@graph_height.to_f -  font_size*2) / (y_max-y_min)
+
+        for data in @data
+          x_points = data[:data][X]
+          y_points = data[:data][Y]
+
+          lpath = "L"
+          x_start = 0
+          y_start = 0
+          x_points.each_index { |idx|
+            x = (x_points[idx] -  x_min) * x_step
+            y = @graph_height - (y_points[idx] -  y_min) * y_step
+            x_start, y_start = x,y if idx == 0
+            lpath << "#{x} #{y} "
+          }
+
+          if area_fill
+            @graph.add_element( "path", {
+              "d" => "M#{x_start} #@graph_height #{lpath} V#@graph_height Z",
+              "class" => "fill#{line}"
+            })
+          end
+
+          @graph.add_element( "path", {
+            "d" => "M#{x_start} #{y_start} #{lpath}",
+            "class" => "line#{line}"
+          })
+
+          if show_data_points || show_data_values
+            x_points.each_index { |idx|
+              x = (x_points[idx] -  x_min) * x_step
+              y = @graph_height - (y_points[idx] -  y_min) * y_step
+              if show_data_points
+                @graph.add_element( "circle", {
+                  "cx" => x.to_s,
+                  "cy" => y.to_s,
+                  "r" => "2.5",
+                  "class" => "dataPoint#{line}"
+                })
+                add_popup(x, y, format( x_points[idx], y_points[idx] )) if add_popups
+              end
+              make_datapoint_text( x, y-6, y_points[idx] )
+            }
+          end
+          line += 1
+        end
+      end
+
+      def format x, y
+        "(#{(x * 100).to_i / 100}, #{(y * 100).to_i / 100})"
+      end
+      
+      def get_css
+        return <<EOL
+/* default line styles */
+.line1{
+	fill: none;
+	stroke: #ff0000;
+	stroke-width: 1px;	
+}
+.line2{
+	fill: none;
+	stroke: #0000ff;
+	stroke-width: 1px;	
+}
+.line3{
+	fill: none;
+	stroke: #00ff00;
+	stroke-width: 1px;	
+}
+.line4{
+	fill: none;
+	stroke: #ffcc00;
+	stroke-width: 1px;	
+}
+.line5{
+	fill: none;
+	stroke: #00ccff;
+	stroke-width: 1px;	
+}
+.line6{
+	fill: none;
+	stroke: #ff00ff;
+	stroke-width: 1px;	
+}
+.line7{
+	fill: none;
+	stroke: #00ffff;
+	stroke-width: 1px;	
+}
+.line8{
+	fill: none;
+	stroke: #ffff00;
+	stroke-width: 1px;	
+}
+.line9{
+	fill: none;
+	stroke: #ccc6666;
+	stroke-width: 1px;	
+}
+.line10{
+	fill: none;
+	stroke: #663399;
+	stroke-width: 1px;	
+}
+.line11{
+	fill: none;
+	stroke: #339900;
+	stroke-width: 1px;	
+}
+.line12{
+	fill: none;
+	stroke: #9966FF;
+	stroke-width: 1px;	
+}
+/* default fill styles */
+.fill1{
+	fill: #cc0000;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill2{
+	fill: #0000cc;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill3{
+	fill: #00cc00;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill4{
+	fill: #ffcc00;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill5{
+	fill: #00ccff;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill6{
+	fill: #ff00ff;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill7{
+	fill: #00ffff;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill8{
+	fill: #ffff00;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill9{
+	fill: #cc6666;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill10{
+	fill: #663399;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill11{
+	fill: #339900;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill12{
+	fill: #9966FF;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+/* default line styles */
+.key1,.dataPoint1{
+	fill: #ff0000;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key2,.dataPoint2{
+	fill: #0000ff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key3,.dataPoint3{
+	fill: #00ff00;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key4,.dataPoint4{
+	fill: #ffcc00;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key5,.dataPoint5{
+	fill: #00ccff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key6,.dataPoint6{
+	fill: #ff00ff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key7,.dataPoint7{
+	fill: #00ffff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key8,.dataPoint8{
+	fill: #ffff00;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key9,.dataPoint9{
+	fill: #cc6666;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key10,.dataPoint10{
+	fill: #663399;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key11,.dataPoint11{
+	fill: #339900;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key12,.dataPoint12{
+	fill: #9966FF;
+	stroke: none;
+	stroke-width: 1px;	
+}
+EOL
+      end
+
+    end
+  end
+end